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6.
What is Power Electronics?
Power electronics is the technology associated with
efﬁcient conversion and control of electric power by using
power semiconductor devices.
Power electronics encompasses the use of electronic
components, the application of circuit theory and design
techniques, and the development of analytical tools toward
efﬁcient electronic conversion, control, and conditioning of
electric power. — Deﬁnition given by IEEE Power
Electronics Society.
R S Ananda Murthy Introduction to Power Electronics

7.
Goal of Power Electronics
Efﬁcient conversion, conditioning, or processing and
control of electric power using solid-state semiconductor
devices in order to supply high quality power to the load
causing minimum pollution of environment and the utility
supply circuit.
R S Ananda Murthy Introduction to Power Electronics

8.
Block Diagram of a Power Processor
Converter
Control Circuit
or
Triggering Circuit
Control
Signals
Reference
Feedforward
Feedback
Raw
Electrical
Power
Output
Electrical
Power
in the Form
Required by
Load
Converter has power switching semiconductor devices and
energy storing elements like inductors and capacitors.
Resistive elements are avoided in converters because they
cause power loss and reduce efﬁciency.
Controller switches on/off the switching devices present in
the converter.
R S Ananda Murthy Introduction to Power Electronics

9.
Example of a Power Processor
Converter 1
Controller Controller
Converter 2
A.C. supply
fixed voltage
at 50 Hz
or 60 Hz
A.C. supply
variable voltage
and frequency
A.C.
motor
−
+
Power processor
CD.C.
A.C. A.C.
A power processor may have more than one stage of
power conversion.
R S Ananda Murthy Introduction to Power Electronics

11.
Power Electronics Vs Signal Processing
In Power Electronics —
The focus is on power conversion at the highest possible
efﬁciency using very small control signals.
Semiconductor devices work as switches.
Power handled may range from a few watts to several
mega-watts.
In Signal Processing —
Semiconductor devices generally work as controlled
sources in the linear region of their characteristics.
The focus is on information processing with minimum loss
of information.
Power handled will be of the order of few milli-watts or few
watts.
R S Ananda Murthy Introduction to Power Electronics

15.
Next Lecture...
In the next lecture we will describe some applications of power
electronics. This will help in recognizing the importance of
power electronics in real life and give motivation for studying
power electronics.
Thank You.
R S Ananda Murthy Introduction to Power Electronics